A kind of high-strength ultra-fine twinned pure titanium and its preparation method

An ultra-fine-grained pure titanium and high-strength technology, which is applied in the field of high-strength ultra-fine twin-crystal pure titanium and its preparation, can solve the problems of decreased toughness, increased strength, and unfavorable material application of pure titanium materials, so as to improve high strength and high strength. The effect of high toughness, avoiding oxidation and improving comprehensive mechanical properties

Active Publication Date: 2022-05-03
SICHUAN UNIV
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Problems solved by technology

[0003] Chinese patent CN102899508A discloses a method for preparing high-strength pure titanium. In this method, the pure titanium material is treated by rolling and crystallization annealing heat treatment. Although the strength of the obtained pure titanium material is ≥ 800 MPa, while increasing the strength, the pure titanium The toughness of titanium materials decreases accordingly, which is not conducive to the application of this material in industry

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  • A kind of high-strength ultra-fine twinned pure titanium and its preparation method
  • A kind of high-strength ultra-fine twinned pure titanium and its preparation method
  • A kind of high-strength ultra-fine twinned pure titanium and its preparation method

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preparation example Construction

[0029] The invention provides a method for preparing high-strength ultrafine twinned pure titanium, comprising the following steps:

[0030] 1) Perform high-energy pulse treatment on pure titanium rods to obtain equiaxed pure titanium;

[0031] 2) annealing the equiaxed pure titanium obtained in step 1) to obtain equiaxed ultrafine-grained pure titanium;

[0032] 3) performing pre-deformation treatment on the equiaxed ultra-fine-grained pure titanium obtained in step 2) to obtain ultra-fine twinned pure titanium.

[0033] In the present invention, the high-energy pulse treatment includes: placing the pure titanium rod in a high-energy pulse device with a frequency of 60-760 Hz, a voltage of 10-600 V, a pulse width of 50-5000 μs, and a current density of 200 A / mm 2 ~6000A / mm 2 ; Preferably, the frequency is 100-660Hz, the voltage is 50-500V, the pulse width is 500-3000μs, and the current density is 500A / mm 2 ~5000A / mm 2 ; More preferably, the frequency is 200-500Hz, the vol...

Embodiment 1

[0044] The preparation method of high-strength ultra-fine twinned pure titanium is as follows:

[0045] 1) Set the high-energy pulse parameters as: frequency 500Hz, voltage 50V, pulse width 50μs, current density 200A / mm 2 . Perform high-energy pulse current treatment on pure titanium rods to obtain equiaxed pure titanium with uniform distribution of microstructure;

[0046] 2) Annealing the equiaxed pure titanium obtained in the previous step at a low temperature of 300°C for 5 minutes in a vacuum tube furnace to obtain equiaxed ultrafine-grained pure titanium;

[0047] 3) The equiaxed ultra-fine-grained pure titanium obtained in the previous step was subjected to uniaxial tensile loading on a tensile machine at room temperature, and the tensile strain rate was 5.0×10 -4 the s -1 , the equiaxed ultra-fine-grained pure titanium is loaded to an engineering strain of 8% and then unloaded, and the sample is removed after complete unloading to obtain high-strength ultra-fine twi...

Embodiment 2

[0049] The preparation method of high-strength ultra-fine twinned pure titanium is as follows:

[0050] 1) Set the high-energy pulse parameters as: frequency 200Hz, voltage 200V, pulse width 50μs, current density 500A / mm 2 . Perform high-energy pulse current treatment on pure titanium rods to obtain equiaxed pure titanium with uniform distribution of microstructure;

[0051] 2) Anneal the equiaxed pure titanium obtained in the previous step at a low temperature of 320°C for 6 minutes in a vacuum tube furnace to obtain equiaxed ultrafine-grained pure titanium;

[0052] 3) The equiaxed ultra-fine-grained pure titanium obtained in the previous step was subjected to uniaxial tensile loading on a tensile machine at room temperature, and the tensile strain rate was 30×10 -4 the s -1 , the equiaxed ultra-fine-grained pure titanium is loaded to an engineering strain of 10% and unloaded, and the sample is removed after complete unloading to obtain high-strength ultra-fine twinned pu...

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Abstract

The invention provides a high-strength ultrafine twinned pure titanium and a preparation method thereof, belonging to the technical field of pure titanium nanometer materials. The invention pre-treats the pure titanium bar through high-energy pulse current, so that the bar structure can be completely equiaxed; and then further refines the structure of the pure titanium bar through low-temperature annealing treatment, so that oxidation is not easy to occur during low-temperature treatment; Finally, the material is pre-deformed, and a large number of twins are introduced into the ultrafine grain, which further increases the strength and toughness of the pure titanium material. The microstructure of the high-strength ultra-fine twinned pure titanium obtained by the invention is uniform and fine, and has the characteristics of high strength and high toughness; and the preparation process of the invention is simple to operate, saves energy, has high efficiency, and can achieve better economic benefits.

Description

technical field [0001] The invention relates to the technical field of pure titanium nanometer materials, in particular to a high-strength ultrafine twinned pure titanium and a preparation method thereof. Background technique [0002] Pure titanium has excellent corrosion resistance, good weldability and manufacturability, and excellent biocompatibility. Therefore, pure titanium is often used as an engineering material and is widely used in industries such as power generation, chemistry, spacecraft and biomedicine. However, its relatively low strength compared with other high-strength titanium alloys hinders its further application. With the increasing use of pure titanium in industry, higher requirements are put forward for the properties of pure titanium materials, including corrosion resistance, biocompatibility and mechanical properties. These properties of pure titanium are closely related to its microstructure (such as the size of grains and the size, distribution, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F3/00
CPCC22F1/183C22F3/00
Inventor 黄崇湘王明赛王艳飞
Owner SICHUAN UNIV
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